Shelf



FIG. 1 is a perspective view showing my new design for a shelf.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a right side view thereof.

FIG. 5 is a top view thereof.

FIG. 6 is a bottom view thereof.

FIG. 7 is a second perspective view thereof, shown in an alternativeconfiguration; and,

FIG. 8 is a third perspective view thereof, shown in environmental use.

The broken lines represent unclaimed subject matter and form no part ofthe claimed design.

CLAIM I claim the ornamental design for a shelf, as shown and described.